JP2010001878A - Intake manifold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve cooling efficiency for intake air, in an intake manifold housing a cooler. <P>SOLUTION: The intake manifold 10 includes a surge tank 11 holding the cooler 20 for cooling the intake air, a plurality of branch pipes 12 which distribute from the surge tank 11 the intake air having passed through the cooler 20 respectively to a plurality of cylinders 4 of an internal combustion engine 1. The surge tank 11 includes a counter wall 14 facing the stream of the intake air in the downstream of the cooler 20, and a plurality of communicating holes 16 which penetrate the counter wall 14 to communicate with corresponding branch pipes 12. Of the plurality of communicating holes 16 arranged in the longitudinal direction L of the counter wall 14, adjoining communicating holes 16 are arranged slantingly in the orthogonal direction O orthogonally intersecting the longitudinal direction L. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an intake manifold that houses a cooler.

  For example, as disclosed in Patent Document 1, an intake system that supplies intake air compressed by a supercharger such as a turbocharger or a supercharger to each cylinder of an internal combustion engine accommodates a cooler to cool the intake air. An intake manifold is used. This is because if intake air whose temperature has been increased by compression is supplied to each cylinder, there is a concern that problems such as knocking and output reduction may occur in the internal combustion engine.

In general, an intake manifold is provided with a surge tank for absorbing intake pulsation and a plurality of branch pipes for distributing intake air that has passed through the surge tank to each cylinder of the internal combustion engine. When the intake air is cooled by the cooler as described above, the cooler is accommodated in a surge tank that forms a relatively large internal space. Therefore, in this case, the intake air cooled by the passage of the cooler is supplied to each cylinder through a plurality of communication holes provided downstream of the cooler of the surge tank and communicating with each branch pipe. It will be.
US Patent Application Publication No. 2007/0175617

  As shown in FIGS. 9 and 10, generally, in the surge tank 1002 of the intake manifold 1000, the communication hole 1004 with each branch pipe is the longitudinal length of the opposing wall portion 1006 that faces the flow of intake air (see the white arrow in FIG. 9). They are arranged in a straight line along the direction L, and there is no deviation in the orthogonal direction O of the longitudinal direction L. Here, a virtual circle 1008 associated with each communication hole 1004 in FIG. 10 represents a passage portion of the intake air that passes through the cooler 1010 and directly enters each communication hole 1004 in the cooler 1010. This is schematically shown by a perspective view from the side opposite to the intake air flow. Therefore, as the hatched area in FIG. 10 obtained by logically summing the virtual circles 1008 increases, the intake air passage area in the cooler 1010 increases and the cooling efficiency of the intake air is improved. Further, as the overlap of the virtual circles 1008 is smaller, the pressure loss of the intake air when passing through the cooler 1010 is reduced, thereby improving the cooling efficiency of the intake air.

  However, in the configuration of FIGS. 9 and 10 in which the communication holes 1004 are linearly arranged along the longitudinal direction L of the opposing wall portion 1006, the mutual interval P between the communication holes 1004 is in the longitudinal direction L of the opposing wall portion 1006. Limited by size. Such a limitation becomes a bottleneck in increasing the passage area and reducing the pressure loss with respect to the intake air passing through the cooler 1010, and hence improvement is desired.

  The present invention has been made in view of these problems, and an object thereof is to improve the cooling efficiency of intake air in an intake manifold that accommodates a cooler.

  The invention described in claim 1 includes a surge tank that houses a cooler that cools intake air, and a plurality of branch pipes that distribute intake air that has passed through the cooler from the surge tank to a plurality of cylinders of the internal combustion engine. The surge tank includes an opposing wall portion facing the flow of intake air downstream from the cooler, and a plurality of communication holes that penetrate the opposing wall portion and communicate with corresponding branch pipes. Among the plurality of communication holes arranged in the longitudinal direction of the opposing wall portion, adjacent communication holes are provided so as to be shifted in an orthogonal direction orthogonal to the longitudinal direction.

  According to the surge tank of the present invention, adjacent holes among the plurality of communication holes arranged in the longitudinal direction of the opposing wall portion facing the intake air flow and communicating with the respective branch pipes are perpendicular to the longitudinal direction. By shifting, the mutual interval can be expanded. According to such an expansion effect of the hole interval, with respect to the intake air that passes through the cooler and directly enters each communication hole of the downstream facing wall portion, the passage area in the cooler is increased and the cooler passes through the cooler. It is possible to reduce the pressure loss during the process. Therefore, it is possible to improve the cooling efficiency of the intake air.

  According to the second aspect of the present invention, the plurality of communication holes are provided along an inclination direction that is inclined with respect to both the longitudinal direction of the opposing wall portion and the orthogonal direction thereof. Thus, each communicating hole provided along the inclination direction with respect to both the longitudinal direction and the orthogonal direction in the opposing wall portion is different from each other with respect to the positions in the longitudinal direction and the orthogonal direction. Thereby, in the opposing wall part, since the adjacent holes among the communicating holes arranged in the longitudinal direction can be reliably obtained in the orthogonal direction, the effect of improving the cooling efficiency can be achieved with a firm effect.

  According to the invention described in claim 3, the plurality of communication holes are provided so as to be alternately shifted at one end side and the other end side in the direction orthogonal to the longitudinal direction in the opposing wall portion. According to this, in the opposing wall portion in which the communication holes arranged in the longitudinal direction are alternately shifted to one end side and the other end side in the orthogonal direction, the positions of the adjacent communication holes are the longitudinal direction and the orthogonal direction. It will be different in both directions. That is, in the opposing wall portion, it is possible to reliably obtain a configuration in which adjacent holes among the communicating holes arranged in the longitudinal direction are shifted in the orthogonal direction, so that the effect of improving the cooling efficiency can be achieved as a solid effect.

  According to the invention described in claim 4, the surge tank is any one of the first through holes provided as the communication holes, the side wall parts provided on both sides of the opposing wall part, and downstream of the cooler. And a second communication hole that communicates with the corresponding branch pipe. As a result, it is possible for each of the first through holes that communicate with the branch pipe through the opposing wall and the second communication hole that communicates with the branch pipe through either of the side walls sandwiching the opposing wall. It is possible to secure an extremely large mutual interval. According to such a hole spacing ensuring action, the side wall portion sandwiches the opposing wall portion of the passage area in the cooler with respect to the intake air that passes through the cooler and directly enters the first and second communication holes on the downstream side. While increasing in the direction, the pressure loss when passing through the cooler can be reduced. Therefore, it is possible to further improve the cooling efficiency.

  According to the invention described in claim 5, the side wall portions are provided on both sides sandwiching the opposing wall portion in the longitudinal direction. According to this, since the second communication hole penetrates the side wall portion on either one of the longitudinal sides where the respective first through holes are arranged in the opposing wall portion, the first and first With respect to the intake air that directly enters the two communication holes, the passage area in the cooler can be reliably increased in the longitudinal direction of the opposing wall portion. Therefore, the further improvement effect of cooling efficiency can be achieved as a firm thing.

  According to invention of Claim 6, a 2nd communicating hole is each provided in the side wall part on both sides which pinches | interposes an opposing wall part. According to this, since the 2nd communicating hole will penetrate a side wall part in the both sides of the opposing wall part which each 1st through-hole penetrates, inhalation which goes directly into these 1st and 2nd communicating holes With respect to air, it is possible to increase the passage area in the cooler in the direction in which the side wall portion sandwiches the opposing wall portion. Therefore, a sufficient improvement in cooling efficiency can be expected.

  The invention according to claim 7 includes a surge tank that houses a cooler that cools the intake air, and a plurality of branch pipes that distribute the intake air that has passed through the cooler from the surge tank to a plurality of cylinders of the internal combustion engine. The surge tank is provided with an opposing wall portion facing the flow of intake air downstream from the cooler and a first series of through holes that communicate with the corresponding branch pipe through the opposing wall portion. And side wall portions provided on both sides of the opposing wall portion, and a second communication hole penetrating one of the side wall portions downstream of the cooler and communicating with the corresponding branch pipe, To do.

  According to the surge tank of the present invention, the first series of through holes communicating with the branch pipe through the opposing wall portion facing the intake air flow, and the branch pipe penetrating through either the side wall portion sandwiching the opposing wall portion, It is possible to secure as large a mutual spacing as possible with the second communication hole that communicates. According to such a hole spacing ensuring action, the side wall portion sandwiches the opposing wall portion of the passage area in the cooler with respect to the intake air that passes through the cooler and directly enters the first and second communication holes on the downstream side. While increasing in the direction, the pressure loss when passing through the cooler can be reduced. Therefore, it is possible to improve the cooling efficiency of the intake air.

  According to the invention described in claim 8, the plurality of first through holes are arranged in the longitudinal direction of the opposing wall portion, and the side wall portions are provided on both sides sandwiching the opposing wall portion in the longitudinal direction. According to this, since the second communication hole penetrates the side wall portion on either one of the longitudinal sides where the respective first through holes are arranged in the opposing wall portion, the first and first With respect to the intake air that directly enters the two communication holes, the passage area in the cooler can be reliably increased in the longitudinal direction of the opposing wall portion. Therefore, the effect of improving the cooling efficiency can be achieved as a firm one.

  According to invention of Claim 9, a 2nd communicating hole is each provided in the side wall part on both sides which pinches | interposes an opposing wall part. According to this, since the second communication hole penetrates the side wall part on both sides of the opposing wall part through which the first series through hole penetrates, the intake air that directly enters the first and second communication holes , The passage area in the cooler in the direction in which the side wall portion sandwiches the opposing wall portion can be increased. Therefore, a sufficient improvement in cooling efficiency can be expected.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In addition, the overlapping description is abbreviate | omitted by attaching | subjecting the same code | symbol to the corresponding component in each embodiment.

(First embodiment)
FIG. 1 shows an intake system 2 of a vehicle internal combustion engine 1 to which an intake manifold 10 according to a first embodiment of the present invention is applied.

  In the intake system 2, the supercharger 3 compresses and sends out intake air in order to increase the output of the internal combustion engine 1. In this embodiment, a turbocharger that uses the exhaust gas of the internal combustion engine 1 is used as the supercharger 3, but a supercharger that uses the rotation of the internal combustion engine 1 may be used.

  The intake manifold 10 is disposed downstream of the supercharger 3 and upstream of the internal combustion engine 1, and includes a surge tank 11 and a plurality of branch pipes 12. The surge tank 11 diffuses the intake air compressed by the supercharger 3 in the internal space 13 in order to absorb intake pulsation. The plurality of branch pipes 12 distribute and supply the intake air that has passed through the surge tank 11 to each cylinder 4 of the internal combustion engine 1. Here, in particular, each branch pipe 12 of the present embodiment is arranged in the horizontal direction of the vehicle on a horizontal plane in accordance with each cylinder 4 of the internal combustion engine 1.

  In the intake manifold 10, a cooler 20 is accommodated in a surge tank 11 that forms a relatively large internal space 13 for the diffusion of intake air. The cooler 20 cools the intake air that is compressed by the supercharger 3 and passes through the surge tank 11 in a high temperature state in order to avoid problems such as knocking and output reduction of the internal combustion engine 1. In the present embodiment, the cooler 20 uses a water-cooled intercooler that exchanges heat between the cooling water and the intake air when the intake air passes between a plurality of tubes (not shown) through which the cooling water flows. However, an air-cooled intercooler using a blower fan may be used.

  Hereinafter, the characteristic part of the intake manifold 10 by 1st embodiment is demonstrated. As shown in FIG. 2, the surge tank 11 of the intake manifold 10 is provided with a facing wall portion 14 that opposes the flow of intake air (see the white arrow in FIG. 2) downstream of the cooler 20. Yes. Here, in particular, the opposing wall portion 14 of the present embodiment is formed in a rectangular flat plate shape that is long in the horizontal direction of the vehicle on a horizontal plane, and faces the cooler 20.

  Further, the surge tank 11 is provided with the same number of communication holes 16 penetrating the opposing wall portion 14 as the branch pipes 12, particularly four in this embodiment, and the branch pipes 12 corresponding to the communication holes 16 respectively. Are communicating. Each communication hole 16 is arranged in the horizontal direction of the vehicle on the horizontal plane in accordance with each branch pipe 12, that is, in the longitudinal direction L of the opposing wall portion 14 in this embodiment, and orthogonal to the longitudinal direction L. Are shifted from each other in the orthogonal direction O. Here, in particular, each communication hole 16 of the present embodiment is provided at equal intervals on the diagonal 18 of the opposing wall 14 that is rectangular in plan view, so that the longitudinal direction L and the orthogonal direction O of the opposing wall 14 can be obtained. They are evenly arranged along the inclination direction I inclined with respect to both.

  Due to the above characteristics, the adjacent holes 16 among the plurality of communication holes 16 arranged in the longitudinal direction L of the opposing wall portion 14 are shifted from each other in the orthogonal direction O of the longitudinal direction L as shown in FIG. As compared with the example of FIG. 10 without deviation, the mutual interval P can be enlarged. Here, the virtual circle 19 associated with each communication hole 16 in FIG. 3 represents the passage portion of the intake air that passes through the cooler 20 and directly enters each communication hole 16 in the cooler 20. This is schematically shown by a perspective view from the side opposite to the intake air flow. Therefore, in the first embodiment, the hatched area of FIG. 3 obtained by ORing the virtual circles 19 is expanded by increasing the interval P between the adjacent communication holes 16 and the intake air passes through the cooler 20. The area can be increased. Further, in the first embodiment, by increasing the interval P between the adjacent communication holes 16, the overlap of the virtual circles 19 corresponding to these holes 16 is reduced, and the intake air when passing through the cooler 20. It is also possible to reduce the pressure loss.

  As described above, according to the first embodiment capable of increasing the passage area and reducing the pressure loss with respect to the intake air passing through the cooler 20, not only the cooling efficiency of the intake air is improved, but also from each communication hole 16. The temperature of the intake air supplied to each cylinder 4 through each branch pipe 12 can be made uniform. Therefore, according to the first embodiment, the output of the internal combustion engine 1 can be increased without causing problems such as knocking.

(Second embodiment)
As shown in FIG. 4, the second embodiment of the present invention is a modification of the first embodiment. In the opposing wall portion 14 of the surge tank 211 of the second embodiment, the plurality of communication holes 216 arranged in the longitudinal direction L are alternately arranged on one end 214a side and the other end 214b side in the orthogonal direction O to the longitudinal direction L. It is shifted and provided in a zigzag shape. Accordingly, the communication holes 216 on the one end 214a side and the communication holes 216 on the other end 214b side that are arranged in the longitudinal direction L and are adjacent to each other are shifted from each other in the orthogonal direction O as shown in FIG. The mutual interval P can be enlarged as compared with the example of FIG.

  Further, particularly in the second embodiment, in the orthogonal direction O shown in FIG. 5, the communication holes 216 on the one end 214 a side of the opposed wall portion 14 are aligned, and the communication holes 216 on the other end 214 b side of the opposed wall portion 14 are aligned. Are also aligned. Thereby, the communication hole 216 on the side of the one end 214a and the communication hole 216 on the side of the other end 214b can be separated as much as possible in the orthogonal direction O of the opposing wall portion 14 to ensure a sufficient interval P. It is possible.

  According to the second embodiment described above, as with the first embodiment, the virtual circle 219 in FIG. 5 associated with each communication hole 216 is enlarged while the hatching area in FIG. can do. Therefore, the passage area and the pressure loss of the intake air passing through the cooler 20 can be increased and the cooling efficiency of the intake air can be improved and the intake air temperature at each communication hole 216 can be made uniform.

(Third embodiment)
As shown in FIG. 6, the third embodiment of the present invention is a modification of the first embodiment. In the surge tank 311 of the third embodiment, communication holes 316a and 316b different from the communication holes 16 are provided in the flat side wall portions 315a and 315b on both sides sandwiching the opposing wall portion 14 in the longitudinal direction L, respectively. Yes. Therefore, in the following description of the third embodiment, the communication holes 16 are referred to as first communication holes 16 and the communication holes 316a and 316b are referred to as second communication holes 316a and 316b.

  Specifically, the second communication hole 316 a that penetrates the one side wall portion 315 a and communicates with the branch pipe 12 is located downstream of the cooler 20. Further, the second communication hole 316 b that penetrates the other side wall portion 315 a and communicates with the branch pipe 12 is located on the downstream side of the cooler 20, and further, the one side wall portion 315 a in the longitudinal direction L of the opposing wall portion 14. Directly facing the second communication hole 316a.

  In the third embodiment having such a feature, the mutual distance between the second communication holes 316a and 316b and the first through holes 16 closest to the side wall portions 315a and 315b through which the second communication holes 316a and 316b pass is set to the length of the opposing wall portion 14. It can be as large as possible in the direction L. According to this, in the longitudinal direction L of the opposing wall part 14 in which the side wall parts 315a and 315b sandwich the opposing wall part 14 and the first series of through holes 16 are arranged, directly to each communication hole 16, 316a and 316b. The passage area of the incoming intake air in the cooler 20 can be reliably increased. Moreover, if a large mutual space is ensured, the pressure loss of the intake air that directly enters the communication holes 16, 316a, 316b can be reduced. From the above, it is possible to achieve improvement in the cooling efficiency of the intake air and equalization of the intake air temperature in each of the communication holes 16, 316a, 316b.

(Fourth embodiment)
As shown in FIG. 7, the fourth embodiment of the present invention is a modification of the third embodiment. In the opposing wall portion 14 of the surge tank 411 of the fourth embodiment, the two first through holes 416 arranged in the longitudinal direction L are arranged in a straight line along the longitudinal direction L and are orthogonal to the longitudinal direction L. There is no deviation in direction O.

  In the fourth embodiment having such a feature, the mutual intervals between the second communication holes 316a and 316b and the nearest first series of through holes 416, and the respective distances, regardless of the same number of communication holes as in the example of FIG. The mutual interval between the first through holes 416 can be ensured as large as possible in the longitudinal direction L of the opposing wall portion 14. Therefore, the passage area and the pressure loss of the intake air passing through the cooler 20 are increased and the cooling efficiency of the intake air is improved and the intake air temperature is uniformized in the communication holes 316a, 316b, and 416. It becomes possible.

(Other embodiments)
Although a plurality of embodiments of the present invention have been described above, the present invention is not construed as being limited to these embodiments, and can be applied to various embodiments without departing from the scope of the present invention. .

  For example, in the first to fourth embodiments, the opposing wall 14 has a shape that is long in the arrangement direction of the branch pipes 12 and can be opposed to the intake air flow. May be set as appropriate. In the second embodiment, the positions of the communication holes 216 on the one end 214a side of the opposing wall portion 14 may be shifted from each other in the orthogonal direction O, or the communication holes 216 on the other end 214b side of the opposing wall portion 14 May be shifted from each other in the orthogonal direction O.

  In the second embodiment, as shown in FIG. 8, second communication holes 316a and 316b may be provided on both sides of the opposing wall portion 14 in the longitudinal direction L according to the third embodiment. In the modification of the second embodiment and the third embodiment, the second communication holes 316a and 316b may be provided on both sides of the opposing wall portion 14 in the orthogonal direction O, or the second communication holes 316a, One of 316b may not be provided, and a plurality of second communication holes 316a and 316b may be provided.

1 is a configuration diagram schematically illustrating an intake system of an internal combustion engine for a vehicle to which an intake manifold according to a first embodiment of the present invention is applied. It is a perspective view for demonstrating the characteristic part of the intake manifold by 1st embodiment of this invention. It is a perspective view for demonstrating the effect of the intake manifold by 1st embodiment of this invention. It is a perspective view for demonstrating the characteristic part of the intake manifold by 2nd embodiment of this invention. It is a perspective view for demonstrating the effect of the intake manifold by 2nd embodiment of this invention. It is a perspective view for demonstrating the characteristic part of the intake manifold by 3rd embodiment of this invention. It is a perspective view for demonstrating the characteristic part of the intake manifold by 4th embodiment of this invention. It is a perspective view for demonstrating the modification of the intake manifold by 2nd embodiment of this invention. It is a perspective view for demonstrating the subject solved by this invention. It is a perspective view for demonstrating the subject solved by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Internal combustion engine, 2 intake system, 3 supercharger, 4 cylinders, 10 intake manifolds, 11, 211, 311 and 411 gauge tanks, 12 branch pipes, 13 interior space, 14 opposing wall part, 16 communication hole, 1st series communication Hole, 18 diagonal line, 19,219 virtual circle, 20 cooler, 214a one end, 214b other end, 216 communication hole, 315a, 315b side wall, 316a, 316b second communication hole, 416 first series hole, L longitudinal direction , O orthogonal direction, I tilt direction, P mutual spacing

Claims (9)

An intake manifold comprising a surge tank that houses a cooler that cools intake air, and a plurality of branch pipes that distribute the intake air that has passed through the cooler from the surge tank to a plurality of cylinders of an internal combustion engine. And
The surge tank has an opposing wall portion that faces the flow of the intake air downstream from the cooler, and a plurality of communication holes that penetrate the opposing wall portion and communicate with the corresponding branch pipe. The intake manifolds, which are adjacent to each other among the plurality of communication holes arranged in the longitudinal direction of the opposing wall portion, are provided so as to be shifted in an orthogonal direction perpendicular to the longitudinal direction.   The intake manifold according to claim 1, wherein the plurality of communication holes are provided along an inclination direction that is inclined with respect to both the longitudinal direction and the orthogonal direction.   2. The intake manifold according to claim 1, wherein the plurality of communication holes are provided so as to be alternately shifted to one end side and the other end side in the orthogonal direction in the facing wall portion.   The surge tank includes a plurality of first through holes provided as the communication holes, side wall parts provided on both sides of the opposing wall part, and one of the side wall parts downstream from the cooler. The intake manifold according to claim 1, further comprising a second communication hole communicating with the corresponding branch pipe.   The intake manifold according to claim 4, wherein the side wall portions are provided on both sides sandwiching the opposing wall portion in the longitudinal direction.   6. The intake manifold according to claim 4, wherein the second communication hole is provided in each of the side wall portions on both sides of the opposing wall portion. An intake manifold comprising a surge tank that houses a cooler that cools intake air, and a plurality of branch pipes that distribute the intake air that has passed through the cooler from the surge tank to a plurality of cylinders of an internal combustion engine. And
The surge tank includes a counter wall portion that opposes the flow of the intake air on a downstream side of the cooler, a first serial hole that passes through the counter wall portion and communicates with the corresponding branch pipe, It has a side wall portion provided on both sides sandwiching the opposing wall portion, and a second communication hole penetrating any one of the side wall portions on the downstream side of the cooler and communicating with the corresponding branch pipe. Intake manifold. A plurality of the first through holes are arranged in the longitudinal direction of the facing wall portion,
The intake manifold according to claim 7, wherein the side wall portion is provided on both sides sandwiching the opposing wall portion in the longitudinal direction.   The intake manifold according to claim 7 or 8, wherein the second communication hole is provided in each of the side wall portions on both sides of the opposing wall portion.

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